package kindergarden.at.google;

import javax.swing.*;
import javax.swing.SpringLayout;
import java.awt.*;

/**
 *
 * @author paja0902 2012-01-31
 * 
 * description: layoutform
 *  
 * 
 */

public class SpringUtilities
{

    public static void printSizes(Component c)
    {
        System.out.println("minimumSize = " + c.getMinimumSize());
        System.out.println("preferredSize = " + c.getPreferredSize());
        System.out.println("maximumSize = " + c.getMaximumSize());
    }

    public static void makeGrid(Container parent,int rows, int cols,int initialX, int initialY,int xPad, int yPad)
    {
        SpringLayout layout;

        try
        {
            layout = (SpringLayout)parent.getLayout();
        }


        catch (ClassCastException exc)
        {
            System.err.println("The first argument to makeGrid must use SpringLayout.");
            return;
        }

        Spring xPadSpring = Spring.constant(xPad);
        Spring yPadSpring = Spring.constant(yPad);
        Spring initialXSpring = Spring.constant(initialX);
        Spring initialYSpring = Spring.constant(initialY);

        int max = rows * cols;

        //Calculate Springs that are the max of the width/height so that all
        //cells have the same size.
        Spring maxWidthSpring = layout.getConstraints(parent.getComponent(0)).getWidth();
        Spring maxHeightSpring = layout.getConstraints(parent.getComponent(0)).getWidth();


        for (int i = 1; i < max; i++)
        {

            SpringLayout.Constraints cons = layout.getConstraints(parent.getComponent(i));
            maxWidthSpring = Spring.max(maxWidthSpring, cons.getWidth());
            maxHeightSpring = Spring.max(maxHeightSpring, cons.getHeight());

        }


        //Apply the new width/height Spring. This forces all the
        //components to have the same size.
        for (int i = 0; i < max; i++)
        {

            SpringLayout.Constraints cons = layout.getConstraints(parent.getComponent(i));
            cons.setWidth(maxWidthSpring);
            cons.setHeight(maxHeightSpring);

        }

        //Then adjust the x/y constraints of all the cells so that they
        //are aligned in a grid.
        SpringLayout.Constraints lastCons = null;
        SpringLayout.Constraints lastRowCons = null;

        for (int i = 0; i < max; i++)
        {
            SpringLayout.Constraints cons = layout.getConstraints(parent.getComponent(i));

            if(i % cols == 0)
            {
                //start of new row
                lastRowCons = lastCons;
                cons.setX(initialXSpring);

            }

            else
            {
                //x position depends on previous component
                cons.setX(Spring.sum(lastCons.getConstraint(SpringLayout.EAST),xPadSpring));
            }

            if (i / cols == 0)
            {
                //first row
                cons.setY(initialYSpring);
            }

            else
            {
                //y position depends on previous row
                cons.setY(Spring.sum(lastRowCons.getConstraint(SpringLayout.SOUTH),yPadSpring));
            }

            lastCons = cons;

        }

        //Set the parent's size.
        SpringLayout.Constraints pCons = layout.getConstraints(parent);
        pCons.setConstraint(SpringLayout.SOUTH,Spring.sum(Spring.constant(yPad),lastCons.getConstraint(SpringLayout.SOUTH)));
        pCons.setConstraint(SpringLayout.EAST,Spring.sum(Spring.constant(xPad),lastCons.getConstraint(SpringLayout.EAST)));
    }

    /* Used by makeCompactGrid. */
    private static SpringLayout.Constraints getConstraintsForCell(int row, int col,Container parent,int cols)
    {
        SpringLayout layout = (SpringLayout) parent.getLayout();
        Component c = parent.getComponent(row * cols + col);
        return layout.getConstraints(c);
    }

    /**
     * Aligns the first <code>rows</code> * <code>cols</code>
     * components of <code>parent</code> in
     * a grid. Each component in a column is as wide as the maximum
     * preferred width of the components in that column;
     * height is similarly determined for each row.
     * The parent is made just big enough to fit them all.
     *
     * @param rows number of rows
     * @param cols number of columns
     * @param initialX x location to start the grid at
     * @param initialY y location to start the grid at
     * @param xPad x padding between cells
     * @param yPad y padding between cells
     */
    public static void makeCompactGrid(Container parent,int rows, int cols,int initialX, int initialY,int xPad, int yPad)
    {
        SpringLayout layout;
        try
        {
            layout = (SpringLayout)parent.getLayout();
        }

        catch (ClassCastException exc)
        {
            System.err.println("The first argument to makeCompactGrid must use SpringLayout.");
            return;
        }

        //Align all cells in each column and make them the same width.
        Spring x = Spring.constant(initialX);
        for (int c = 0; c < cols; c++)
        {
            Spring width = Spring.constant(0);

            for (int r = 0; r < rows; r++)
            {
                width = Spring.max(width,
                getConstraintsForCell(r, c, parent, cols).getWidth());

            }
            for (int r = 0; r < rows; r++) 
            {

                SpringLayout.Constraints constraints = getConstraintsForCell(r, c, parent, cols);
                constraints.setX(x);
                constraints.setWidth(width);

            }

            x = Spring.sum(x, Spring.sum(width, Spring.constant(xPad)));
        }

       // Align all cells in each row and make them the same height.
        Spring y = Spring.constant(initialY);
        for (int r = 0; r < rows; r++)
        {
            Spring height = Spring.constant(0);

            for (int c = 0; c < cols; c++)
            {

                height = Spring.max(height, getConstraintsForCell(r, c, parent, cols).getHeight());

            }


            for (int c = 0; c < cols; c++)
            {

                SpringLayout.Constraints constraints =getConstraintsForCell(r, c, parent, cols);
                constraints.setY(y);
                constraints.setHeight(height);

            }

            y = Spring.sum(y, Spring.sum(height, Spring.constant(yPad)));
            
        }

        //Set the parent's size.
        SpringLayout.Constraints pCons = layout.getConstraints(parent);
        pCons.setConstraint(SpringLayout.SOUTH, y);
        pCons.setConstraint(SpringLayout.EAST, x);
    }
}

